A firewall can be classified as a:

A.
Directory based access control.

B.
Rule based access control.

C.
Lattice based access control.

D.
ID based access control.

Explanation:
Rule based access control is based on a specific profile for each user. Information can
be easily changed for only one user but this scheme may become a burden in a very large
environment. A rule-based access control unit will intercept every request to the
server and compare the source specific access conditions with the rights of the user in
order to make an access decision. A good example could be a firewall. Here a set of
rules defined by the network administrator is recorded in a file. Every time a
connection is attempted (incoming or outgoing), the firewall software checks the rules
file to see if the connection is allowed. If it is not, the firewall closes the
connection.